Support link hovering.

services/navigation/public/interfaces/view.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module navigation.mojom;
 
 import "components/mus/public/interfaces/window_tree.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "url/mojo/url.mojom";
 
 interface ViewFactory {
   CreateView(ViewClient client, View& view);
 };
 
 interface ViewClient {
   LoadingStateChanged(bool is_loading);
   NavigationStateChanged(url.mojom.Url url,
                          string title,
                          bool can_go_back,
                          bool can_go_forward);
   LoadProgressChanged(double progress);
+  UpdateHoverURL(url.mojom.Url url);
+
   ViewCreated(View view,
               ViewClient& client,
               bool is_popup,
               gfx.mojom.Rect initial_rect,
               bool user_gesture);
   Close();
 };
 
 interface View {
   // Navigates the view to |url|.
   NavigateTo(url.mojom.Url url);
 
   GoBack();
   GoForward();
   Reload(bool skip_cache);
   Stop();
 
   // Obtains a Mus WindowTreeClient for the View, so it can be embedded in a
   // UI.
   GetWindowTreeClient(mus.mojom.WindowTreeClient& client);
 
   ShowInterstitial(string html);
   HideInterstitial();
+
+  // The resize area is a rectangle in the bottom corner of the view that allows
+  // the top-level window containing the view to be interactively resized.
+  SetResizerSize(gfx.mojom.Size size);
 };